Seeing that her husband, who runs a convenience store, is having trouble with shoplifting, Mari consults with a security company where her sister, Anna's husband, works. Anna, who was thinking about her sister's body, decides to stand in the store as shoplifting G-men with Mari who has no experience. After the two stood at the store, Mari caught a few shoplifters and was relieved, but Mari misidentified and arrested them. The two who were deceived by the shoplifter who should have seen it with their own eyes learned that there was a big thief behind them ...